PROCESS FOR PHOSPHATING METAL SURFACES

摘要

A process for phosphating the surfaces of iron-based metals, zinc-based metals or combination of such surfaces by treating the metal surfaces with ah aqueous acidic zincphosphating solution comprising from about 0.1 to about 2.0g/l of zinc ion, from about 5 to about 40g/l of phosphate ion, from about 0.01 to 20.0g/l as tungsten of soluble tungsten compound and a conversion coating accelerator. The metal surfaces thus phosphated with the solution are suitable for electrocoating.